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Lookup NU author(s): Dr Alasdair Charles, Professor Sudipta Roy
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The electrochemical behaviour of electrodeposited Co-Cu/Cu multilayers from citrate electrolytes was investigated using cyclic voltammetry and stripping techniques at a rotating ring disc electrode. Copper and cobalt-copper alloy sandwiches were deposited from an electrolyte containing 0.0125 M CuSO4, 0.250 M CoSO4 and 0.265 M trisodium citrate at two different pHs, 1.7 and 6.0. The Cu/Co-Cu/Cu sandwich is representative of a single layer in a Co-Cu/Cu multilayer deposit, which is known to exhibit unusual physical and magnetic properties. Results from cyclic voltammetry and detection of dissolving species at the ring showed that cobalt is stripped from a Cu/Co-Cu/Cu sandwich even when a copper layer as thick as 600 nm covers the Co-Cu alloy. Scanning electron microscopy showed that cobalt can dissolve from the deposit easily because the copper layer covering the Co-Cu alloy is porous. A separate series of experiments with Cu/Co-Ni-Cu/Cu sandwich showed that cobalt does not dissolve from these deposits because the addition of nickel stabilises cobalt in the Co-Ni-Cu alloy.
Author(s): Dulal SMSI, Charles EA, Roy S
Publication type: Article
Publication status: Published
Journal: Journal of Applied Electrochemistry
Year: 2004
Volume: 34
Issue: 2
Pages: 151-158
ISSN (print): 0021-891X
ISSN (electronic): 1572-8838
Publisher: Springer
URL: http://dx.doi.org/10.1023/B:JACH.0000009945.92160.25
DOI: 10.1023/B:JACH.0000009945.92160.25
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